Tedera tolerance of herbicides and small crumbweed control

摘要

Tedera (Bituminaria bituminosa C.H. Stirton) is a new perennial leguminous pasture being developed for broadacre agriculture in Western Australia. Weed control around planting is required for reliable establishment especially in areas where small crumbweed (Dysphaniapumilio (R.Br.) Mosyakin & Clemants) occurs. Small crumbweed is an allelopathic, Western Australian native plant that is spreading across Australia as a weed of crops and pastures. Young tedera showed useful tolerance to diflufenican, flumetsulam, glyphosate. imazamox, terbutryn, a bromoxynil plus diflufenican mix, a bromoxynil plus MCPA mix and an amitrole plus paraquat mix as spring applications in a Mediterranean environment in South Western Australia. These herbicides all provide around 90% control of small crumbweed with less than 10% damage to the tedera. No product tested provided complete control of small crumbweed without damage to the tedera.Imazethapyr was also well tolerated by tedera but did not provide small crumbweed control. Atrazine, cyanazine and metribuzin were also tested but were generally too damaging to the tedera at normal label rates.As there are no herbicides specifically registered for use in tedera pastures, this work provides an indication of which products could be targets for the production of registration packages. This paper reports the results of an experiment where 12 herbicides were applied with a logarithmic sprayer to determine the dose response of young tedera and small crumbweed.